500kV酒杯塔变坡节点受压性能分析及优化建议  

Analysis of Compression Performance and Optimization Suggestions on Slope Transition Joint of 500kV Cup-type Towers

作　　者：廖邢军 李磊 龚涛 向越 Liao Xingjun;Li Lei;Gong Tao;Xiang Yue(China Electric Power Engineeing Consulting Group Southwest Electric Power Design Institute Co.,Ltd.,Chengdu 610021,China)

机构地区：[1]中国电力工程顾问集团西南电力设计院有限公司,成都610021

出　　处：《特种结构》2024年第3期29-35,共7页Special Structures

摘　　要：酒杯塔在输电线路中广泛使用,变坡节点作为酒杯塔最重要的节点之一,在工程设计时,多采用双包连接的构造方式(内包角钢、外贴板互焊),且较常规节点加大了内包角钢和外贴板的厚度。目前行业内对其受力性能的研究较少,规程规范也未明确其设计方法,本文结合ZNC33153B试验塔实测数据,采用有限元软件对ZNC33153B塔变坡节点的受压性能进行了分析。分析表明瓶口下主材偏心受力较严重,但由于节点刚度大,按目前内包角钢、外贴板互焊的构造方式是安全可靠的;取消内包钢或外贴板不互焊,均会降低节点刚度,降低下主材的受压承载力;由于变坡节点主要靠正面传力,按现行的设计方法对大使用条件的杆塔正面螺栓数量偏少,存在安全隐患。基于分析数据,提出了考虑偏心受力的螺栓抗剪设计方法。The cup-type tower is widely used in transmission lines.The slope transition joint,as one of the most critical component,is commonly constructed by connecting inner steel angles or welding outer steel plates to enhance the strength.Comparing to conventional joints,the thickness of the inner steel angle and outer steel plate is increased.However,research on the load-bearing performance of these slope transition joints remains limited within the industry,and existing regulations do not explicitly define their design methods.In this paper,the compression performance of slope transition joints in the ZNC33153B testing tower is analyzed using finite element software.The results show that the eccentric load on the lower main structure near the bottle neck is sig-nificant.Due to the joint,s substantial stiffness,the current commonly used construction method provides a safe and reliable solution.However,if the inner angles or outer welded plates are removed or not interconnected,the stiffness of the joint will be reduced,resulting in a reduction in the compressive load capacity for the lower main structure.Additionally,since the slope transition joints primarily transmit force from the front,the current design method may lead to insufficient bolt quantities and pose safety risks.Based on the analysis,a bolt shear design method that accounts for eccentric loading to enhance the safety and reliability of slope transition joints in cup-type transmission towers is proposed.

关 键 词：输电线路 酒杯塔 变坡节点 真型试验 受压承载力 

分 类 号：TM75[电气工程—电力系统及自动化] TU279.7[建筑科学—建筑设计及理论]